Steam generator and water heater



Oct 9 E. F. SPANNER 2,217,458

. STEAN GENERATOR AND WATER HEATER Filed Oct. 20, 1937 2 Sheets-Sheet 1j C/g Z Edwd rd ank Spanner IN v E N TO K,

Oct. 8, 1940. F. SPANNER 2,217,458

STEAM GENERATOR AND WATER HEATER Filed Oct. 20,1937 2 Sheets-Sheet 2Edwcwd Frqnkbpq'nn u IN VE NTOR.

Patented Oct. 8, 1940 UNITED STATES PATENT OFFICE Application October20, 1937, Serial No. 169,993 In Great Britain January 29, 1937 2 Claims.

This invention relates to improvements in steam generators and waterheaters and has particular reference to such devices as are heated bywaste hot gases such for example as the exhaust gases from Dieselengines.

The principal object of the present invention is to provide a verysimple but efiicient device for the generation of steam by means ofwaste gases.

In the drawings:

Fig. 1 is a longitudinal section through a waste heat recovery unit ofmodified construction receiving waste gases from four independentsources;

Fig. 2 is a cross section of the construction shown in Fig. 1 taken onthe line 22 of that figure;

Fig. 3 is a cross section through a waste heat steam generator utilisinggases from three independent sources;

Referring to the drawings, denotes an outer shell, and 3 the two tubeplates connected to the outer shell I at the external peripheriesthereof. A nest of water tubes 6 including stay tubes I is provided forstrengthening the tube plates 3. A tube 5| is arranged axially in theouter shell I and connected to the tube plates 3 by their innerperipheries.

The water and steam space in this construction is completed by the ends2| which connect the tube 5| to the outer shell I, the tube 51 as wellas the outer shell I being provided with openings for the passage of theheating gases.

The arrangement shown in Figs. 1 and 2 is suitable for the utilisationof gases from four independent sources, said gases being admitted to thenests of water tubes 6 by openings 8 in the outer shell and allowed toescape through the openings 9| in the central tube 5|.

To maintain the longitudinal strength of this structure, reinforcingelements l3 are mounted in the openings 8 and 9| and in order to preventintermingling of the different streams of waste gas, partitions I81 arearranged between the various sections and the openings 8 are providedwith separate inlet connections I62.

In some cases it may be desirable to provide for greater distribution ofthe hot gases during their flow through the nests of water tubes 6 thanis possible in the arrangements described and to this end the partitionsl8! may be arranged tangentially to the central tube 5| as shown in Fig.3.

In the construction shown in Fig. 3 gas from three separate sources isprovided. for and the openings 8 and 91 are reinforced by members l3 asbefore, the openings 8 being provided with inlet connections I63.

I claim:

1. An improved steam generator and water heater for waste heat recoverycomprising an outer tension resisting substantially cylindrical shell, asubstantially cylindrical conduit for hot gas extending axiallythroughout said shell, end covers for said shell through which saidconduit passes, two tube plates mounted in said shell in paralleltransverse planes disposed about halfway between the transverse middleplane of said shell and its end covers, respectively, said tube platesbeing peripherally connected to said shell and said conduit to form twospaced annular water and steam chambers, compression resisting watertubes mounted in said tube plates and axially connecting said two waterand steam chambers, a hot gas admission port in said shell to admit hotgas to the space between said tube plates in a direction transversely ofsaid water tubes, and a hot gas discharge port in the portion of saidcylindrical conduit between said tubes.

2. An improved steam generator and water heater for waste heat recoverycomprising an outer tension resisting substantially cylindrical shell, asubstantially cylindrical conduit for hot gas extending axiallythroughout said shell, end covers for said shell through which saidconduit passes, two tube plates mounted in said shell in paralleltransverse planes disposed about halfway between the transverse middleplane of said shell and its end covers, respectively, said tube platesbeing peripherally connected to said shell and said conduit to form twospaced annular Water and steam chambers, partitions extending in thespace between said tube plates from the inner periphery of the shell tothe outer periphery of the conduit to subdivide said space into aplurality of compartments, a plurality of compression resisting watertubes in each compartment mounted in said tube plates and axiallyconnecting said two water and steam chambers, a hot gas admission portin said shell for each of said compartments to admit the hot gas to thecompartment in a direction transversely of said water tubes, and a hotgas discharge port for each compartment connecting the same with the 50central conduit.

EDWARD F. SPANNER.

